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Local structure, magnetism, and superconductivity in Sr analogs of Fe-doped YBa2Cu3−y Fe y O6+x

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Abstract

The local structure, magnetism, and superconductivity of Y1−z Ca z Sr2Cu3−y Fe y O6+x have been investigated by magnetic susceptibility,57Fe Mössbauer absorption spectroscopy, X-ray powder diffraction, and iodometric titration. By modification of the hole distribution between the Cu(1)O x chains and Cu(2)O2 sheets, we induced bulk superconductivity with a maximum superconducting critical temperatureT c near 20 K in Y−zCa z Sr2Cu2.5Fe0.5O6+x (0.05≤z≤0.18). We interpret the development of a broad maximum inT c and the Meissner fractionV f versusz nearz=0.12 to be due to an increasing transfer of holes from the Cu(1)O x chains to the Cu(2)O2 sheets induced by a shorterc-axis and reduced Coloumb repulsion of the positively charged Y1−z Ca z plane. The increase in hole transfer from the Cu(1)O x chains to the Cu(2)O2 sheets also modulates the magnetic ordering temperatureT m. We show thatT m of YSr2Cu2FeO7.26 is approximately 65 K, which is much lower than that observed in YBa2Cu2.31Fe0.69O7.21 (T m≈400 K).

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Authors and Affiliations

  1. Los Alamos National Laboratory, 87545, Los Alamos, NM, USA

    M. G. Smith, R. D. Taylor, J. D. Thompson & J. O. Willis

  2. The University of Texas at Austin, 78712, Austin, TX, USA

    J. B. Goodenough & J. Chan

Authors
  1. M. G. Smith
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  2. R. D. Taylor
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  3. J. D. Thompson
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  4. J. O. Willis
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  5. J. B. Goodenough
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  6. J. Chan
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Smith, M.G., Taylor, R.D., Thompson, J.D. et al. Local structure, magnetism, and superconductivity in Sr analogs of Fe-doped YBa2Cu3−y Fe y O6+x . Hyperfine Interact 93, 1665–1670 (1994). https://doi.org/10.1007/BF02072925

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  • DOI: https://doi.org/10.1007/BF02072925

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